Machine or apparatus for testing worms and worm-wheels.



P. BROWN & P. J. BOSTOGK. MACHINE 0R APPARATUS FOR TESTING WORMS AND WoRM-WHEELs.

APPLICATION FILED 0GT.8 1913..

Patented Dec. 22, 1914.

4 SHEETISSH.EBT 1.

I BROWN & P. J. BOSTOGK. MACHINE 0R APPARATUS FOR TESTING WORMS AND WORM WHEELS.

APPLIOATION FILED 0012s, 1913 Patented D60. 22,1914.

4 SHEETS-SHEET 2.

\ I I I I I P. BROWN & F. J. BOSTOGK.

MACHINE OR APPARATUS FOR TESTING WORMS AND WORM WHEELS.

APPLIGA'IVION FILED 00-128, 1913.

v1 1 2 25 06 9. Patented Dec. 22, 1914.

4 SHEETS-SHEET 3.

P. BROWN & F. J. BOSTOGK, MACHINE 0R APPARATUS FOR TESTING WORMS AND WORM WHEELS.

APPLICATION FILED 0012B, 1913.

Patented Dec. 22, 1914.

A /6 w I 2 7 1 3 3 H .1 G 1 9 1 rune! Bnown nn manners JOHN Bos'ro'cK, or finnnnnsrrstn, nnenann.

MACHINE onnrra'na'rus son Specification .of Letters int nt.

rnsrmo won-ms AND wean-warrants.

Patented Dec. e2, 1914.

A pplication'flled October 8,1913. Seria1No.7:94,048.

Bnown and ing worms and worm. wheels to ascertain their secured in any desire .boss- 1 accuracy, new or improved machine or apparati'ls by means of which an effective and reliable test of, the accuracy of a worm, and of wheels to work therewith, may be obtained.

Our improved machine or apparatus, and

the manner in which the same'is to be employed will be described with reference to the accompanying drawings in which:

' Figure 1 is a front view partly in section, showing the general arrangement of the machine; Fig. 2 is a front View on a smaller scale showing the testing of the ac curacy of the thread of a worm after hardenin and stretching, Fig. 3 is a similar view to Fig. 2, showing the testingrof the pressure angle of the worm thread, ig. 4 is an end view, looking in the direction of the arrow A, Fig. 1; Fig. 5 is a plan view; Figs. 6 and 7 are respectively a side and a front View, on a 'largescale, of'the portion of the apparatus or testin .the pressure angle of a worm, and Figs. and9 are details of the portion of the lapparatus'for testing the accurac of a'worm thread.

Re erring to the -drawin s,the machine comprises a suitable edesta or base l'having two longitudina 1y extending slides 2 and 3, on which are mounted headstocks 4 and 5 having centers 6 and 7 between which the worm to be tested is supported as shown at Figs. 2 and 3.

A saddle 8Fig. 2 ads ted to be adjustably position on either of the slides 2 or 3 by means of a clamping screw 9 Fig. 6, has a vertical boss 10 through which passesa vertical spindle 11 having a keywa 12 intowhich enters a key 13 in the The spindle 11 is thus capable of vertical movement but is prevented from having any rotary movement. Mounted in bearings inthe boss 10 is a worm or a pinion 14, the spindle of which has fast thereon the milled disks 15, 15, and this worm or pinion meshes with a rack 16 on the vertical 7, or a bracket and consists in the provision of a' worm will indicate,

spindle 11. Rotation of the worm, in one direction or the other, will cause the spindle to be raised or lowered, as will be understood. v

Toward its upper end the spindle 11 has a collar 17 inade integral with or secured to.

it and this collar is adapted to support on the spindle either a bracket 18 Figs. 6 and '19, Fig 8 and each of the saidbrack ts 'hayinga bored boss adapted to fit over'the portion of the spindle 11 above the collar 17. The upper end of the indie 11 is screwed as at 20 and is provide with a nut 21 by means of which either of the brackets 18 or 19 may be secured in position onv the spindle. Rotary movement of a bracket around the spindle is prevented by a set screw 22 or 23.

The bracket 18 carries a protractor plate 24 and a pivoted-blade or pointer 25- provid d with a ortion 26 carrying an indicating mark so isposed that when the edge of the blade or pointer is laid against the flank of a worm thread the indicating mark on the protractor pla e, the of inclination of the thread. The blade or ointer 25 is made heavier than the arm 6 so that the said blade or pointer will always tend to fall andthus recorrect, angle main in contact with the flank of the thread as the Worm is revolved.

The bracket 19 (Figs. 8 and 9) carries a gage 27 of suitable construction provided with-a suitably divided disk 28 over which a pointer 29 is movable by means oil a spring plun' er 30. A. ter having been I the worm to be tested issupported between the centers 6 and 7 of the adiustab'le heads stocks 4 an 5, and "the accuracy of the thread is first ascertained. This is eflected as follows :-A truly spherical ball 31 of suitable diameter held in a suitable tool or holder not shown, is placed in a. space of the worm as shown. at Fig, 8 aid the bracket 19'is secured on thespindle 1 1 with the plunger 30 resting on the lihrdehed and stretched,

. a l 31- "I spindle'll is adiusted vertically by means of the and any such movement will be transmitted I by the spring plunger to the pointer 29 3 the thread upon 'oralternatively thefllower end of the which will indicate on the dial 28 the amount of inaccuracy and according to which side of the zero mark the pointer is moved, will indicate the nature of the inac-. curacy.

placed in position thereon. The pressure angleof the worm is now tested, as shown 'at Fig. 7, one face of each thread being tested, after which the worm is reversed in.

the centers and the opposite faces of the threads tested. In place of a'ball a cylindrical test'bar may be-laid in the. angle of space forthe plunger. 30 to rest plunger may itself be suitably constructed to ridein the thread space and the use'of a ball or test bar be dispensed with.

T 0 enable worm wheels tobe tested the base 1 has a slide 32 in which is mounted a bracket 33 having a nut bearing'34 through which passes a traverse screw 35 support-' v ed in bearings 36, 36, in the.-bed and provided at 'each end with an operating hand wheel 37. A scale 38 carried by the bed facilitates accurate positioningof the bracket 33. The bracket 33 has an externally screwed sleeve 39 Fig. 1 whose vertical position can be adjusted by a micromete-r nut 40 Fig. 4 'andthe sleeve 39 supports, on a ball bearing 41at its upper end, a worm wheel supporting plate 42 havin a depending sleeve 43 extending down Wit in the sleeve 39. A fixed centering spindle 44 extends up within the sleeve 43. I The worm wheel to be tested is placed upon the spindle 44 and rests loosely upon the supporting plate 42.. By means of the traverse screw 35, the bracket 33 is moved toward the worm which is supported between the headstocks 4 and 5, until the scale 38 indicates that the correct distance between the axis of the worm and the center of the spindle 44 is reached. I The worm wheel is then adjusted vertically by means of the micrometer device 40 until its center is in horizontal alinement'with the axis of a the worm. The latter, which has preferably been already tested as before described andany inaccuracies corrected, is then slowly rotated by hand, and carries the worm wheel gradually around, the correctness of the meshingbeing ascertained by the operator I When each space in the worm has been thus tested, the bracket 19 is removed from the spindle l1 and the bracket 18 in the usual way. By the means above set forth, the-worm and worm wheel can be accurately set in the exact relative positions they are to occupy when at work, and correction of any inaccuracies in the worm wheel is facilitated.

The details of construction and arrange.

ment of the apparatus may be varied.

Having. thus described our invention, what we claim as new and desire to secure by Letters Patent is I I 1 In a machine for testing wormgearing, the combination, with means for revolubly supporting a worm, of a. support adjustable crosswise of the axis of the worm, a sleeve. carried by the said support-and.ad u'stable in a plane .at a right angle to the lane in which the support is adjustable, an a revoluble plate for 'sl lppor'ting a worm, wheel in gear with the worm, said plate being provided with a centering spindle and. a sleeve which is journaled inthe aforesaidlsleeveh 2. In a machine for; testing wormgearin the combination, with a base, and two hea centers between which the worm is support: ed; .of a bracket mounted on the said base andadjustable crosswise of the headstocks,1 a vertically adjustable sleeve carried by the .86 stocks mounted thereon and provided with said bracket, and a revoluble plate for sup- 7 porting a worm-wheel in gear with. the said worm, said plate being provided with a centering spindle anda' sleeve which naled in the aforesaid sleeve.

'3. A machine for testing worm gearing.

comprising a base, two. headstocksmounted thereon and provided with centersbetween which the worm is supported, -a saddle mounted on the. base and provided with a s j in: 

